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International Component for Unicode for Java (ICU4J) is a mature, widely used Java library providing Unicode and Globalization support

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// © 2022 and later: Unicode, Inc. and others.
// License & terms of use: https://www.unicode.org/copyright.html

package com.ibm.icu.message2;

import java.util.List;
import java.util.Map;

/**
 * The interface that must be implemented by all selectors
 * that can be used from {@link MessageFormatter}.
 *
 * Selectors are used to choose between different message variants,
 * similar to plural, selectordinal,
 * and select in {@link com.ibm.icu.text.MessageFormat}.
 *
 * @internal ICU 72 technology preview
 * @deprecated This API is for technology preview only.
 */
@Deprecated
public interface Selector {
    /**
     * A method that is invoked for the object to match and each key.
     *
     * For example an English plural {@code matches} would return {@code true}
     * for {@code matches(1, "1")}, {@code matches(1, "one")}, and {@code matches(1, "*")}.
     *
     * @param value the value to select on.
     * @param keys the key to test for matching.
     * @param variableOptions options that are not know at build time.
     * @return the formatted string.
     *
     * @internal ICU 72 technology preview
     * @deprecated This API is for technology preview only.
     */
    @Deprecated
    List matches(Object value, List keys, Map variableOptions);
}